Handle git aliases in hook processing

[cnaples79]

Summary

• resolve git aliases before dispatching hooks so aliased commands still trigger hook logic
• expand aliases using git config (ignoring shell aliases) and prepend alias args to original args
• add tests covering alias expansion and argument passthrough

Rationale

Commands invoked via git aliases (e.g., , ) were bypassing git-ai hooks. Resolving aliases to their underlying commands ensures hooks still run.

Changes

• resolve alias definitions and rewrite parsed command/args prior to hook dispatch
• ignore shell-style aliases
• add unit tests for alias expansion behavior

Test Plan

• unit tests added for alias expansion

Closes #377

[CLAassistant]

All committers have signed the CLA.

[svarlamov]

@cnaples79 Thank you so much for your first contribution to Git AI!

Excited to get this functionality merged in! Do you have a some time to add more end-to-end tests via the TestRepo harness and possibly take a look at a native git config implementation? #377

I think gix-config is production-ready: https://github.com/GitoxideLabs/gitoxide/tree/main/gix-config

I'm open to merging without a native git config implementation, however, in that case, I think we should add a benchmark to verify we're not adding more than 5-10ms per command. Thanks again and happy to talk this through https://calendly.com/acunniffe/meeting-with-git-ai-authors anytime

[svarlamov]

@cnaples79 I would love to be able to merge this soon. Have you had a chance to look at the CLA?

[cnaples79]

@svarlamov I've signed the CLA! Sorry I missed your first comment. I can definitely take some time for your requests, it may be a couple days though I'm currently out of town.

[svarlamov]

Just a heads up #376 is being kindly picked up by @bernoussama so will probably have to try to sync up these PRs. Probably the fix for #376 first and hopefully it'll all just work with this PR. Thanks folks!